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Eliyahu Rips
Eliyahu Rips ( he, אליהו ריפס; russian: Илья Рипс; lv, Iļja Ripss; born 12 December 1948) is an Israeli mathematician of Latvian origin known for his research in geometric group theory. He became known to the general public following his co-authoring a paper on what is popularly known as Bible code, the supposed coded messaging in the Hebrew text of the Torah. Biography Ilya (Eliyahu) Rips grew up in Latvia (then part of the Soviet Union). His mother was Jewish and from Riga, the only of nine siblings that survived the war; the others were killed in Rumbula and other places. His father Aaron was a Jewish mathematician from Belarus; his wife, children, and all of his relatives were killed during the Holocaust. Rips was the first high school student from Latvia to participate in the International Mathematical Olympiad. In January 1969, he learnt from listening to Western radio broadcast — then illegal in the USSR — of the self-immolation of Czechoslovak stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Latvia
Latvia ( or ; lv, Latvija ; ltg, Latveja; liv, Leţmō), officially the Republic of Latvia ( lv, Latvijas Republika, links=no, ltg, Latvejas Republika, links=no, liv, Leţmō Vabāmō, links=no), is a country in the Baltic region of Northern Europe. It is one of the Baltic states; and is bordered by Estonia to the north, Lithuania to the south, Russia to the east, Belarus to the southeast, and shares a maritime border with Sweden to the west. Latvia covers an area of , with a population of 1.9 million. The country has a temperate seasonal climate. Its capital and largest city is Riga. Latvians belong to the ethno-linguistic group of the Balts; and speak Latvian, one of the only two surviving Baltic languages. Russians are the most prominent minority in the country, at almost a quarter of the population. After centuries of Teutonic, Swedish, Polish-Lithuanian and Russian rule, which was mainly executed by the local Baltic German aristocracy, the independent R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rumbula Massacre
The Rumbula massacre is a collective term for incidents on November 30 and December 8, 1941, in which about 25,000 Jews were murdered in or on the way to Rumbula forest near Riga, Latvia, during the Holocaust. Except for the Babi Yar massacre in Ukraine, this was the biggest two-day Holocaust atrocity until the operation of the death camps. About 24,000 of the victims were Latvian Jews from the Riga Ghetto and approximately 1,000 were German Jews transported to the forest by train. The Rumbula massacre was carried out by the Nazi ''Einsatzgruppe'' A with the help of local collaborators of the Arajs Kommando, with support from other such Latvian auxiliaries. In charge of the operation was Höherer SS und Polizeiführer Friedrich Jeckeln, who had previously overseen similar massacres in Ukraine. Rudolf Lange, who later participated in the Wannsee Conference, also took part in organizing the massacre. Some of the accusations against Latvian Herberts Cukurs are related to the clear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group Isomorphism Problem
In abstract algebra, the group isomorphism problem is the decision problem of determining whether two given Presentation of a group, finite group presentations refer to Isomorphism, isomorphic Group (mathematics), groups. The isomorphism problem was formulated by Max Dehn, and together with the Word problem for groups, word problem and conjugacy problem, is one of three fundamental decision problems in group theory he identified in 1911. All three problems are Decidability (logic), undecidable: there does not exist a computer algorithm that correctly solves every instance of the isomorphism problem, or of the other two problems, regardless of how much time is allowed for the algorithm to run. In fact the problem of deciding whether a group is trivial is undecidable, (See Corollary 3.4) a consequence of the Adian–Rabin theorem due to Sergei Adian and Michael O. Rabin. References * Group theory Undecidable problems {{Abstract-algebra-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Group Action (mathematics)
In mathematics, a group action on a space is a group homomorphism of a given group into the group of transformations of the space. Similarly, a group action on a mathematical structure is a group homomorphism of a group into the automorphism group of the structure. It is said that the group ''acts'' on the space or structure. If a group acts on a structure, it will usually also act on objects built from that structure. For example, the group of Euclidean isometries acts on Euclidean space and also on the figures drawn in it. For example, it acts on the set of all triangles. Similarly, the group of symmetries of a polyhedron acts on the vertices, the edges, and the faces of the polyhedron. A group action on a vector space is called a representation of the group. In the case of a finite-dimensional vector space, it allows one to identify many groups with subgroups of , the group of the invertible matrices of dimension over a field . The symmetric group acts on any set wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Congress Of Mathematicians
The International Congress of Mathematicians (ICM) is the largest conference for the topic of mathematics. It meets once every four years, hosted by the International Mathematical Union (IMU). The Fields Medals, the Nevanlinna Prize (to be renamed as the IMU Abacus Medal), the Carl Friedrich Gauss Prize, Gauss Prize, and the Chern Medal are awarded during the congress's opening ceremony. Each congress is memorialized by a printed set of Proceedings recording academic papers based on invited talks intended to be relevant to current topics of general interest. Being List of International Congresses of Mathematicians Plenary and Invited Speakers, invited to talk at the ICM has been called "the equivalent ... of an induction to a hall of fame". History Felix Klein and Georg Cantor are credited with putting forward the idea of an international congress of mathematicians in the 1890s.A. John Coleman"Mathematics without borders": a book review ''CMS Notes'', vol 31, no. 3, April 1999 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aharon Katzir Prize
Aharon אַהֲרֹן is masculine given name alternate spelling, commonly in Israel, of '' Aaron'', prominent biblical figure in the Old Testament, "Of the Mountains", or "Mountaineer". There are other variants including "Ahron" and "Aron". Aharon is also occasionally a patronymic surname, usually with the hyphenated prefix "Ben-". People with the name include: Given name * Aharon Abuhatzira (1938–2021), Israeli politician * Aharon Amar (born 1937), Israeli footballer * Aharon Amir (1923–2008), Israeli poet, translator, and writer * Aharon Amram (born 1939), Israeli singer, composer, poet, and researcher * Aharon Appelfeld (1932–2018), Israeli novelist and Holocaust survivor * Aharon April (1932–2020), Russian artist * Aharon Barak (born 1936), Israeli lawyer and jurist * Aharon Becker (1905–1995), Israeli politician * Aharon Ben-Shemesh (1889–1988), Israeli writer, translator, and lecturer * Aharon Chelouche (1840–1920), Algerian landowner, jeweler, and moneycha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hebrew University Of Jerusalem
The Hebrew University of Jerusalem (HUJI; he, הַאוּנִיבֶרְסִיטָה הַעִבְרִית בִּירוּשָׁלַיִם) is a public research university based in Jerusalem, Israel. Co-founded by Albert Einstein and Dr. Chaim Weizmann in July 1918, the public university officially opened in April 1925. It is the second-oldest Israeli university, having been founded 30 years before the establishment of the State of Israel but six years after the older Technion university. The HUJI has three campuses in Jerusalem and one in Rehovot. The world's largest library for Jewish studies—the National Library of Israel—is located on its Edmond J. Safra campus in the Givat Ram neighbourhood of Jerusalem. The university has five affiliated teaching hospitals (including the Hadassah Medical Center), seven faculties, more than 100 research centers, and 315 academic departments. , one-third of all the doctoral candidates in Israel were studying at the HUJI. Among its first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Israel
Israel (; he, יִשְׂרָאֵל, ; ar, إِسْرَائِيل, ), officially the State of Israel ( he, מְדִינַת יִשְׂרָאֵל, label=none, translit=Medīnat Yīsrāʾēl; ), is a country in Western Asia. It is situated on the southeastern shore of the Mediterranean Sea and the northern shore of the Red Sea, and shares borders with Lebanon to the north, Syria to the northeast, Jordan to the east, and Egypt to the southwest. Israel also is bordered by the Palestinian territories of the West Bank and the Gaza Strip to the east and west, respectively. Tel Aviv is the economic and technological center of the country, while its seat of government is in its proclaimed capital of Jerusalem, although Israeli sovereignty over East Jerusalem is unrecognized internationally. The land held by present-day Israel witnessed some of the earliest human occupations outside Africa and was among the earliest known sites of agriculture. It was inhabited by the Canaanites ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aliyah
Aliyah (, ; he, עֲלִיָּה ''ʿălīyyā'', ) is the immigration of Jews from Jewish diaspora, the diaspora to, historically, the geographical Land of Israel, which is in the modern era chiefly represented by the Israel, State of Israel. Traditionally described as "the act of going up" (towards the Jerusalem in Judaism, Jewish holy city of Jerusalem), moving to the Land of Israel or "making aliyah" is one of the most basic tenets of Zionism. The opposite action—emigration by Jews from the Land of Israel—is referred to in the Hebrew language as ''yerida'' (). The Law of Return that was passed by the Knesset, Israeli parliament in 1950 gives all diaspora Jews, as well as their children and grandchildren, the right to relocate to Israel and acquire Israeli citizenship on the basis of connecting to their Jewish identity. For much of Jewish history, their history, most Jews have lived in the diaspora outside of the Land of Israel due to Jewish military history, various hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warsaw Pact Invasion Of Czechoslovakia
The Warsaw Pact invasion of Czechoslovakia refers to the events of 20–21 August 1968, when the Czechoslovak Socialist Republic was jointly invaded by four Warsaw Pact countries: the Soviet Union, the Polish People's Republic, the People's Republic of Bulgaria and the Hungarian People's Republic. The invasion stopped Alexander Dubček's Prague Spring liberalisation reforms and strengthened the authoritarian wing of the Communist Party of Czechoslovakia (KSČ). About 250,000 Warsaw Pact troops (afterwards rising to about 500,000), supported by thousands of tanks and hundreds of aircraft, participated in the overnight operation, which was code-named Operation Danube. The Socialist Republic of Romania and the People's Republic of Albania refused to participate, while East German forces, except for a small number of specialists, were ordered by Moscow not to cross the Czechoslovak border just hours before the invasion because of fears of greater resistance if German troops were inv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jan Palach
Jan Palach (; 11 August 1948 – 19 January 1969) was a Czech student of history and political economics at Charles University in Prague. His self-immolation was a political protest against the end of the Prague Spring resulting from the 1968 invasion of Czechoslovakia by the Warsaw Pact armies. Death In August 1968, the Soviet Union invaded Czechoslovakia to crush the liberalising reforms of Alexander Dubček's government during what was known as the Prague Spring. Prague-born Palach decided to sacrifice himself in protest of the invasion and set himself on fire, in Wenceslas Square, on 16 January 1969. According to a letter he sent to several public figures, an entire clandestine resistance organization had been established with the purpose of practising self-immolation until their demands were met; however, it seems that such a group never existed. The demands declared in the letter were the abolition of censorship and a halt to the distribution of ''Zprávy'', the officia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Self-immolation
The term self-immolation broadly refers to acts of altruistic suicide, otherwise the giving up of one's body in an act of sacrifice. However, it most often refers specifically to autocremation, the act of sacrificing oneself by setting oneself on fire and burning to death. It is typically used for political or religious reasons, often as a form of non-violent protest or in acts of martyrdom. It has a centuries-long recognition as the most extreme form of protest possible by humankind. Etymology The English word '' immolation'' originally meant (1534) "killing a sacrificial victim; sacrifice" and came to figuratively mean (1690) "destruction, especially by fire". Its etymology was from Latin "to sprinkle with sacrificial meal (mola salsa); to sacrifice" in ancient Roman religion. ''Self-immolation'' was first recorded in Lady Morgan's ''France'' (1817). Effects Self-immolators frequently use accelerants before igniting themselves. This, combined with the self-immolators' refusal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
